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Let's take a look at how the Links panel can help us identify the resolution of images and prevent any output issues before they happen. I'm going to open up my Links panel, and in there I went ahead and I added the scaling of it. To do that, I went under panel Options and I clicked on Scale. What that allows me to do is look at the different images with not only the resolution, but also how much they've been scaled. Now we never want the resolution to be less than 200 pixels per inch. So when I scale an image down, that's fine if it has high enough resolution to begin with.
But if I want to scale an image to a higher resolution, I have to make sure it never drops below 200 pixels per inch. Now, this is with Photoshop files typically. But you can also have scaling issues with Illustrator files. For example, I have an Illustrator file here that's been scaled 37%. Now, normally that would not be an output issue since Illustrator files are resolution-independent. But you run into issues with items being scaled too small, in that you can't see them on the metal plates. Let me show you an example. I'm going to go over to Illustrator, and in here I see that this map has some type in it and also has some lines.
Now my current line has two points. If I scale this 50%, my stroke will be one point, which is just fine. But when I start scaling it too much lower, I run the potential problem of not being able to see that line at time of output. Let me go back to InDesign. In here, when I click on my Illustrator file, I can see it selected in my Links panel, and it tells me it's been scaled 37%. So the thing you have to be concerned about with line art in Illustrator files is that when you scale them, I would be concerned I don't scale them too small and that I can't read the type or the line art that appears in the file.
As far as Photoshop files go, we can scale them, whether they're larger or smaller, but we want to make sure our effect of resolution is always 200 pixels per inch or greater. Using the Links panel, we can see how much images have been scaled and what the resolution of those images are.
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